Hello, this is my first post here. I'm building an electromagnet as part of a larger experiment in my lab. My magnet needs to move a magnetic thread made with a paramagnetic substance. This string just barely responds to strong magnetic fields (tested it with standard speaker magnets). The electromagnet I'm building thus needs to generate a strong enough magnetic field to move this piece, even just so slightly. I can't afford to use a ferrite core because of hysteresis effects - I need to rapidly switch between multiple electromagnets and cant afford to have hysteresis causing a delay. Any suggestions on how I can do this? Suggestions on any core that I can use to amplify the field that has a really low coercivity? or any configuration (i'm currently trying a regular solenoid, maybe horseshoe solenoid?, dont know) or even any other method that I can employ to generate the field. To summarize, I need to switch between multiple electromagnets to move a magnetic material (that responds poorly, hence a strong field is required) and need a solution on magnifying the field intensity that doesn't involve expensive cores (mumetal costs a lot, i think). Big question, I'm sure. I'm using a Gauge 20 wire and have a standard power supply for power (about 3 amps max). Tried higher gauge wires - more turns, easier to wind - but they heat up too much and the field isn't impressive anyway. Appreciate any help in advance, Thanks!